Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
  • C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
  • C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
  • C08G18/6685—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/48—Polyethers
  • C08G18/50—Polyethers having heteroatoms other than oxygen
  • C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
  • C08G18/5024—Polyethers having heteroatoms other than oxygen having nitrogen containing primary and/or secondary amino groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
  • C08K5/098—Metal salts of carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G2101/00—Manufacture of cellular products
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G2120/00—Compositions for reaction injection moulding processes

Definitions

• the present invention relates to an internal mold release agent for use in a reaction injection molding process for the preparation of optionally cellular, polyurea elastomer moldings.
• U.S. Pat. No. 4,886,838 describes the use of a salt of an amidine and a phenolic hydroxyl containing compound to solubilize a zinc carboxylate containing form 8 to 24 carbon atoms per carboxylate group.
• the resultant mixture is used in a RIM process.
• the reference does describe the use of zinc laurate in combination with the salts noted.
• the present invention is directed to a process for the production of optionally cellular, polyurea elastomer moldings by reacting a reaction mixture consisting essentially of:
• a polyether having at least two isocyanate-reactive groups and a molecular weight of 1800 to 12,000 in which at least 50% of the isocyanate-reactive groups are primary and/or secondary amino groups,
• component (II) of a chain extender comprising a sterically hindered aromatic diamine
• the present invention is also directed to an isocyanate-reactive component for use in a RIM process based on components (II), (III) and (IV).
• polyurea refers not only to pure polyureas, i.e., polyisocyanate polyaddition products prepared exclusively from polyisocyanates and polyamines, but also to polyisocyanate polyaddition products prepared from polyamines and other compounds containing isocyanate-reactive groups such as polyhydroxyl compounds, provided that at least 50% of the isocyanate-reactive groups are primary and/or secondary amino groups.
• the polyisocyanate component (I) to be used in accordance with the present invention may be an aliphatic, cycloaliphatic, araliphatic or preferably an aromatic polyisocyanate, i.e., a polyisocyanate in which all of the isocyanate groups are aromatically bound.
• aromatic polyisocyanates examples include 2,4- and/or 2,6-diisocyanatotoluene; 2,2'-, 2,4'- and/or 4,4'-diisocyanatodiphenylmethane, mixtures of the last-mentioned isomers with their higher homologs (such as those obtained by phosgenating aniline/formaldehyde condensates); compounds containing urethane groups obtained as products of reaction of the above-mentioned di- and/or polyisocyanates with subequivalent quantities of aliphatic polyhydroxyl compounds having molecular weights of 62 to 700, (e.g.
• isocyanate starting materials include the derivatives of 4,4'-diisocyanatodiphenylmethane which are liquid at room temperature.
• specific examples of such compounds are polyisocyanates containing urethane groups obtainable according to German Patent 1,618,380 (U.S. Pat. No.
• 3,644,457 by reacting one mole of 4,4'-diisocyanatodiphenylmethane with about 0.05 to 0.3 moles of low molecular weight diols or triols, preferably polypropylene glycols having a molecular weight below 700; and diisocyanates based on 4,4'-diisocyanatodiphenylmethane containing carbodiimide and/or uretone imine groups such as those disclosed in U.S. Pat. Nos. 3,152,162, 3,384,653, 3,449,256, and 4,154,752, and German Offenlegungsschrift No. 2,537,685.
• polyisocyanates are also included among the preferred polyisocyanates.
• modification products based on mixtures of 2,4'- and 4,4'-diisocyanatodiphenylmethane or mixtures of the above-described modified 4,4'-diisocyanatodiphenylmethanes with minor quantities of higher than difunctional polyisocyanates of the diphenylmethane series.
• Such polyisocyanates are described in German Offenlegungsschrift 2,624,526.
• the preferred polyisocyanates are generally polyisocyanates or polyisocyanate mixtures of the diphenylmethane series which are liquid at room temperature and have optionally been chemically modified as described above, have an average isocyanate functionality of 2 to 2.2 (preferably 2) and contain 4,4'-diisocyanatodiphenylmethane as the main component (preferably in an amount of more than 50% by weight).
• the polyethers (component II) to be used in accordance with the present invention contain at least two isocyanate-reactive groups in end positions and have an average molecular weight (calculated from the functionality and the isocyanate-reactive group content) of about 1800 to 12,000, preferably about 2000 to 8000. At least about 50 equivalent %, preferably about 80 to 100 equivalent % of the isocyanate-reactive end groups are primary and/or secondary (preferably primary) aromatically or aliphatically bound amino groups with the remainder being primary and/or secondary aliphatically bound hydroxyl groups.
• individual components of the mixture may have a molecular weight below 1800 (for example between 500 and 1800), provided that the average molecular weight of the mixtures is within the range of 1800 to 12,000.
• molecular weight below 1800 (for example between 500 and 1800)
• the use of mixtures containing large quantities of individual components which have molecular weights below 1800 is, however, not preferred, even when the average molecular weight is within the disclosed ranges.
• Compounds containing amino end groups may be prepared by the conversion of existing end groups or they may be attached to the polyether chain by urethane, ether or ester groups.
• Suitable polyether polyols for preparing the amine-terminated polyethers are known and disclosed in U.S. Pat. Nos. 4,305,857 and 4,218,543, both of which are herein incorporated by reference.
• the "amino polyethers” may be prepared by known methods.
• One such method is the amination of polyhydroxy polyethers (e.g., polypropylene glycol ethers) by reaction with ammonia in the presence of Raney nickel and hydrogen (Belgium Patent No. 634,741).
• U.S. Pat. No. 3,654,370 discloses the preparation of polyoxyalkylene polyamines by reaction of the corresponding polyol with ammonia and hydrogen in the presence of a nickel, copper or chromium catalyst.
• the preparation of polyethers containing amino end groups by the hydrogenation of cyanoethylated polyoxypropylene ethers is described in German Patent 1,193,671.
• Relatively high molecular weight polyhydroxy polyethers suitable for the process of the present invention may be converted into the corresponding anthranilic acid esters by reaction with isatoic acid anhydride.
• German Offenlegungsschriften 2,019,432 and 2,619,840 and U.S. Pat. Nos. 3,808,250; 3,975,428; and 4,016,143 disclose methods for making polyethers containing aromatic end groups.
• Relatively high molecular weight compounds containing amino end groups may be obtained according to German Offenlegungsschrift 2,546,536 or U.S. Pat. No. 3,865,791 by reacting isocyanate prepolymers based on polyhydroxy polyethers with hydroxyl-containing enamines, aldimines or ketimines and hydrolyzing the reaction product.
• Amino polyethers which have been obtained by the hydrolysis of compounds containing isocyanate end groups are preferred starting materials and can be used alone or in admixture with other amino polyethers, especially those obtained by the amination of polyether polyols.
• polyethers preferably containing two or three hydroxyl groups are reaction with excess quantities of polyisocyanates to form isocyanate-terminated prepolymers and the isocyanate groups are then converted in a second step into amino groups by hydrolysis.
• Other patents relating to the preparation of these amino polyethers include U.S. Pat. Nos.
• polyethers containing amino phenoxy end groups and having a low viscosity are also preferred. These aminopolyethers may be economically prepared in accordance with German Offenlegungsschrift 3,713,858, and may be used alone or in admixture with the other previously described aminopolyethers.
• amino polyethers used in accordance with the present invention are in many cases mixtures of the compounds described above. These mixtures generally should contain (on a statistical average) two to three isocyanate-reactive end groups.
• the "amino polyethers” may also be used as mixtures with polyhydroxy polyethers which are free from amino groups (such as those previously disclosed as precursors for the amino polyethers, or highly branched polyether polyols having an average hydroxyl functionality of about 3 to 6 and molecular weights of about 500 to 1000), although such mixtures are less preferred.
• mixtures are used, however, it is necessary to ensure that at least about 50 equivalent % of the isocyanate reactive groups present in the mixture are primary and/or secondary amino groups.
• mixed amino/hydroxyl polyethers i.e., polyethers containing both amino and hydroxyl groups, provided that at least 50% of the isocyanate-reactive groups in the polyether component are primary and/or secondary amino groups.
• These mixed amino/hydroxyl polyethers may be prepared, e.g., by aminating only a portion of the hydroxyl groups of a polyether polyol.
• Suitable chain extenders include the known low molecular isocyanate-reactive compounds such as aromatic polyamines, especially diamines, having molecular weights of less than about 800, preferably less than about 500.
• Preferred chain extenders include the sterically hindered aromatic diamines which contain at least one linear or branched alkyl substituent in the ortho position to the first amino group and at least one, preferably two, linear or branched alkyl substituents containing at least one, preferably one to three carbon atoms in the ortho position to the second amino group.
• aromatic diamines include 1-methyl-3,5-diethyl2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,6-diaminobenzene, 1,3,5-trimethyl-2,4-diaminobenzene, 1-methyl-5-t-butyl-2,4-diaminobenzene, 1-methyl-5-t-butyl-2,6-diaminobenzene, 1,3,5-triethyl-2,4-diaminobenzene, 3,5,3',5'-tetraethyl-4,4'-diaminodiphenylmethane, 3,5,3',5'-tetraisopropyl-4,4'-diaminodiphenylmethane, 3,5-diethyl-3',5'-diisopropyl-4,4'-diaminodiphenylmethane, 3,3'-diethyl-5,5'-di
• mixtures of 1-methyl-3,5-diethyl-2,4-diaminobenzene and 1-methyl-3,5-diethyl-2,6-diaminobenzene in a weight ratio between about 50:50 to 85:15, preferably about 65:35 to 80:20.
• unhindered aromatic polyamines may be used in admixture with the sterically hindered chain extenders and include 2,4- and or 2,6-diaminotoluene, 2,4'- and/or 4,4'-diaminodiphenylmethane, 1,2- and 1,4-phenylene diamine, naphthalene-1,5-diamine and triphenyl methane-4,4',4"-triamine.
• the difunctional and polyfunctional aromatic amine compounds may also exclusively or partly contain secondary amino groups such as 4,4'-di-(methylamino)-diphenylmethane or 1-methyl-2-methylamino-4-aminobenzene.
• Liquid mixtures of polyphenyl polymethylene polyamines of the type obtained by condensing aniline with formaldehyde are also suitable.
• the nonsterically hindered aromatic diamines and polyamines are too reactive to provide sufficient processing time in a RIM system. Accordingly, these diamines and polyamines should be used in combination with one or more of the previously mentioned sterically hindered diamines.
• the chain extender (III) is used in quantities of about 5 to 50%, preferably about 8 to 30% and most preferably about 12 to 26% by weight, based on the weight of the high molecular weight isocyanate-reactive component (II).
• Suitable zinc carboxylates are those containing from 10 to 14 carbon atoms per carboxylate group. Suitable materials include zinc laurate, zinc decanoate, and zinc tetradecanoate with zinc laurate being preferred.
• the carboxylates are generally present in an amount of about 0.5 to 20% by weight, preferably about 1 to 15% by weight and more preferably about 1 to 10% by weight, based on the weight of components (II) and (III), in order to obtain mold release properties.
• tertiary amine containing solubilizers of the type described in U.S. Pat. No. 4,581,386, can also be used.
• auxiliary agents and additives including additional internal mold release agents, reinforcing agents, blowing agents, catalysts, surface active additives (emulsifiers and foam stabilizers), reaction retarders, cell regulators, fillers, pigments, flame retardant agents, age resistors, stabilizers to protect against weathering, plasticizers, fungistatic and bacteriostatic substances, may also be included in the compositions according to the present invention. Examples of these types of auxiliary agents and additives are set forth in U.S. Pat. Nos.
• compositions according to the present invention may be molded using conventional RIM processing techniques.
• two separate streams are intimately mixed and subsequently injected into a suitable mold, although it is possible to use more than two streams.
• the first stream contains the polyisocyanate component (I), while the second stream contains the high molecular weight isocyanate-reactive component (II), the chain extender (III), the internal mold release agent (IV) and generally any other additive which is to be included.
• the mold release agent Prior to use, the mold release agent may be blended with the remainder of the isocyanate-reactive components of the second stream and agitated briefly to ensure homogeneity. If used, a reinforcing agent may be added to the resin blend at this time.
• Polyol A glycerine-initiated poly(oxyalkylene)-polyether triol having an OH number of 35 and prepared from 83 wt. % propylene oxide followed by 17% ethylene oxide.
• D-2000 an amine terminated polyether supplied by Texaco having a functionality of 2 and a molecular weight of 2000.
• T-5000 an amine terminated polyether supplied by Texaco having a functionality of 3 and a molecular weight of 5000.
• DETDA diethyl toluene diamine
• TETROL An amine-initiated poly(oxyalkylene)polyether tetrol having a hydroxyl number of about 630 and obtained by the addition of about 5 moles of propylene oxide to one mole of ethylene diamine.
• Surfactant A commercial silicone surfactant supplied as L-5304 by Union Carbide.
• ISO An isocyanate-terminated prepolymer having an NCO content of 17.5% and prepared by reacting (i) a phosgenated aniline/formaldehyde condensation product containing 82.5% of 4,4'-diphenylmethane-diisocyanate, 5% of the 2,4'-isomer and the remainder higher functional homologs, with (ii) Polyol.
• a resin blend was prepared from 46.2 parts of T-5000, 19.8 parts of D-2000, 31.7 parts of DETDA, 1.7 parts of ZNS, and 0.6 parts of Surfactant, and reaction injection molded with ISO at an isocyanate index of 105 in a Cincinnati Milacron RIM-90 using a 24" ⁇ 36" plaque tool.
• the tool was precoated with RCTW2006, a commercially available soap from Chemtrend. Twenty plaques were made. Half of the plaques were post cured at 250 F. for 1 hour, while the other half were left at room temperature (i.e., no post curing).
• a second resin blend was produced identical to the first, except that 1.7 parts of ZNL were substituted for the 1.7 parts of ZNS.
• the second resin blend was molded in the same manner and the twenty plaques made were treated in the same manner.

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Polyurethanes Or Polyureas (AREA)
• Compositions Of Macromolecular Compounds (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24011876

Family Applications (1)

Country Status (5)

Cited By (6)

Families Citing this family (1)

Citations (12)

Family Cites Families (2)

• 1990
  • 1990-04-06 US US07/505,797 patent/US5135962A/en not_active Expired - Fee Related
• 1991
  • 1991-03-19 CA CA002038623A patent/CA2038623A1/en not_active Abandoned
  • 1991-03-26 EP EP19910104722 patent/EP0450460A3/en not_active Withdrawn
  • 1991-04-04 KR KR1019910005408A patent/KR910018485A/ko not_active Application Discontinuation
  • 1991-04-05 JP JP3072827A patent/JPH04225016A/ja active Pending

Patent Citations (13)

Also Published As

Similar Documents

Legal Events